timkarnold

#!/usr/bin/env python3
r"""
Volt SHVCS unbrick -- all in one.

Reads the HPCM2 security seed over a VXDIAG VCX Nano (J2534), auto-computes the
unlock key, and clears the SHVCS / "Propulsion Power Is Reduced" fault. No app,
no subscription, no Techline -- just the Nano you already own.

Pipeline (all to the HPCM2 at CAN 0x7E4, ISO15765 @ 500k):
    27 01            -> read seed (67 01 XX XX)